Based on the barely visible search radar underneath the fuselage and the characteristic tail with a MAD (Magnetic Anomaly Detector) boom, the aircraft seems to be a Tu-142M "Bear F", a reconnaissance and ASW variant derived from the iconic Tu-95 Bear bomber.

Whilst the "standard" Tu-95 s have already been used to carry out air strikes against Syrian ground targets beginning in November last year, the one spotted over Aleppo would be (if confirmed) the first Tu-142 to take part in the air war over Syria.

As said the Tu-142 was developed as a maritime patrol and anti-submarine aircraft. However, it is believed to be able to carry different sensor packages and some believe the Bear F could be used as an ISR (Intelligence Surveillance Reconnaissance) platform, to pinpoint targets for tactical strike aircraft.